Yes. The Testosterone System works to bring your cortisol into balance so that your body can get back to producing the hormones you need in the amounts you need. When you stop taking the Testosterone System and your cortisol goes back to being elevated by the stressors of life, your hormones get suppressed.
If you skip a day? Or a few? No Worries. The Testosterone System works over time, so if you miss a few days you won't significantly impact your benefits. That said, don't make a habit of it if you want to continue to see increased energy, clarity, and improved performance.